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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ce39a3b44b28a990ccf6eb4a3a2e0ee2ba219591aa832365bc6b2ecc900a60' 
  AND token = 'uLB4mgthAT6wOFprj58rs8bn8Ju3jR2117e4bnUyQfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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