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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae2c961de42844548d5f323546aceb4e08f0f7f41893d13e60c3b3de61c5527' 
  AND token = '0Jg9mY1vlMdFLbe5JfxQBIm+AwBjiFkQn92Lul/J5PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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