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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb70b5044f0133d39bb6952b40fafeda694a4dc163093b0e6a272bd3a78dae31' 
  AND token = 'iU8bivj2gQnPteB7tWsU8VXEGrqjJMb8/lY1zc1gHXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}