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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c4de78303991089064a5ea239c37632c358cc4622cea20dc4d4e59e2ad71bf' 
  AND token = 'GdXc9TYPXpsfdP+feG0PjhNsP3J2mp9Jik+yWiITOok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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