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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841910f637a039410f6750597c5a066ffdc9557bba59f8335b8c5911e6f2f0e0' 
  AND token = 'IjzMlTbKPMf4ieT+wdNj9tVpEnSNwqJ621dOsz9r3PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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