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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5933d3889aa2d26b363fee6d0ae6f23918601f7d44651cb41784db3ea719260a' 
  AND token = 'cZV2UkOYC8c8P3I3hBPc0hnWUdHkHePP/750waVTZcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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