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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8991fda11cd644da29fc8136a8893d3f08d422ff89378d633b84702fe998d44' 
  AND token = '3aCi4WN4zp3eHzjoJEIdqammjdp/X0oS+P7M0+AtlZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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