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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f05353e7836e29591c96e2b5a089f23abee8021a840137e8a9609037f02068f' 
  AND token = 'd+tSAqe7wsOxYAgyxkRRKuHfcVkow1962tKVlRFooM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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