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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ee2180c179852d9d2666955dcb620b5436c4ccddf35a1e10041a11d937481b' 
  AND token = 'LfX7cO5ETtQc4/4hJ3DNdB/huaqrFOM4TkGtRk4LNUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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