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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9d35b16e1e93818eb8ad1e401dc1c3d52596588d2143fe3cf6d02eb8d035d4' 
  AND token = 'hUeGQcncrjK+mxzCkAF9XCanY0ljnw79nnVgH+sAyok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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