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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a60dcd8c50694b49ee733c5dd6c6ac9ac99e262d0f9c250cf859e87ba0a8dd9' 
  AND token = 'OGsSnXKVx+rzo7VvWZQbWcmpoHUUyqejGceMe9p0k98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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