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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1139876c48dcc71c56b49017316514db87aa37653d17547364160498c855a6' 
  AND token = 'mn1UHYDAneve/eAjJdu9TWKXt3ISKoYrZmfhjy0M4Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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