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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f8fc6b8c05b1b8808ffde2dde49387f3cc15b150dd04f58592ba86809b8840' 
  AND token = 'F+C0EPleTGKYkaq7APWqGkEKBJnMDmIPTAWRIk56/yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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