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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f005a891a319785f272fe7640434506e577021a3898f1744cb35fce17674af0' 
  AND token = 'SX4WpJibvUFL82OeG8ibOnwt8SGK9F79C9rLSVulzA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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