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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b3209778e440068f880c733a63f043e9c8dc46fcb1d85ca95abe0c9f4b5ab4' 
  AND token = 'Ab+YRJDbxAvJNy5gnt6dxbPGkw0vhK4dvP4zNPzDET8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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