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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5c68674b8668dfb1da1801d5aa6341303a7c9d6691ea124b4b90a3b4791144' 
  AND token = 'NUS1wOfk9mSaf3Q3drBD/Xygm43nSRBQVrRbMTGYpUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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