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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbec8d207da45bed28ab4af2326960a113230d9d0a4c3243ce2791e95770951' 
  AND token = 'CKlnmKDBdpkuixX4ggKJr3/enlntm4lHe+K+d/H6Pbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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