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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30393d2e2397645eba72b4b9f7df54bb70deb36463dd11c0c105adba1343db19' 
  AND token = 'NFzzSNhc1CcKLkDvvERCa3Oqi/r8ToyInOkovTLOphY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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