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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4026826d805f687d7b4a7b7a5d1097dd8f26cf5a798330be44f184fce28eb5ba' 
  AND token = 'IGxLpp+jDws41Y8Lz00EJzr7yjabj7CyaHjgMVqEUU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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