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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe676521aeccd8d4f4becba0b4381ed92bb0bf6bb85202193ad4b3a0a69c874' 
  AND token = 'nv3NygRPDZGkd3bP5DC/uw83/SP+xkSp83ReVtFF7n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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