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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dab3bee94f1098b3d4a8e9121c2b52b7c7c13b945b31ca6648c8950ee02f6d' 
  AND token = 'hZ/r2c1mvUM6rA4fg0HKhviLw6HIOM/uk7yykcXL6z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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