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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeec875e20e4351293e94af74af0a2e0835dc171b61f8cc3166dfe7fe7ea15b5' 
  AND token = 'Eulfq0w/a9EdDHhkk4IVMxo2haaS6j3sEeGkse6Agfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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