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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719e43e1d8db70f54df6a03c2906af43d9c0c4d44693011f0990b95faa0dcd5e' 
  AND token = 'Hfpm0nsmdARwyFRHEr4vvc0+iwznIVh82swg88R65Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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