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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9ee944002d22e5c94f285b73fd97d99d8b2a0fbac58cd62125b3d31cfc7868' 
  AND token = 'GmOp9QzkAUVnF12M6KHk2HhnPtrUdpMMeNGxOHD5N1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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