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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc21b5a5cc548326c59f82e5ae2abb785ebc0e05d8adb65fa89889f54a6ecb80' 
  AND token = 'OuZ16o4ED5Xvd7vOWw1ZPAZLxWCdwevftDKC6yQ0dfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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