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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea45f1e2258f75c52bd69ecc12b2e8d76e2ac18e7206278e20b104fc0174a73' 
  AND token = 'YuDKgd2LQVy89k8IHJJnzbCNRRdWM6+qGuqXX44pCf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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