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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e48d45848efd5f61adaf032d31596e1e32605d788766c2d1aeadecec7dc17d' 
  AND token = 'RXoptu/eSYvnHgtJR/zfP1P2jsmtuBcOQC8cf0KQ8sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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