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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68f82f8573f9ba628521f799dd8fd8e1dbae543cc713d1d4744bbe4acf311e0' 
  AND token = 'zrstVMM6QMQN3IXIpt9Kdl7rs7QeZIbOIkM4qRgXpwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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