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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d6d0d5deb991a5cb0a1e56cd9fc36d3477a78057158193e5dc752b5ae04867' 
  AND token = 'DQlu4yM9Mxb3uE/2xUBx+3ZrCF40il49hV8D4s8tL10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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