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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb55f134f1dcbe929c4ccbb615707f8aaacf0a48fb79ef6164bab0dd78745e8f' 
  AND token = 'IajVWK8PrVWQQo/49zPpAPUO2u3m6nLZd0zk3sCYD4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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