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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940704217126c3d7ec2a9995102b23aac6e4730b2f9c32c70a65abb7cbc9dd64' 
  AND token = 'vC4KriqDBR2IYLAkeOvBPLalDOlpjl713jRV+QzeuC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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