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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add2fe2361d6ebd463344fd80a38a0c9c752194d8305cebe32b1231057715301' 
  AND token = 'Mc5jnXrw2khotTo6QTpaqZ2iYUS8n1UHnyyIZBmuywU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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