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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65492554fbe38f77a73900b93332ff5debbb23effd63aaa78805e0d2cd475faa' 
  AND token = '72BwxtulhCprZnDB3uyTx7JR2f+zE5FX9vg6gI5h7DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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