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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79e2a0998ca8afab883952fc2014b773e9ef92a68385885c16129df09005eef' 
  AND token = '9g4z7DJQv1eqPBJA58/yqFqNkuG2GAR9SDgB4ecVdE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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