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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d84ac0c3d000fda9fe754fbaf5f5fef1522901e2476f3cf1f3408d8dbc1786' 
  AND token = '17/bOjqUNce1QCSNOD/uXD1BJ/LG3OwbuUBVYWuPvb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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