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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcad064eb66bdbec45e524cd65150f52d6fa21300ce71fd5bc112abffe9c0466' 
  AND token = 'cHlEWdWd1uL81JRp9F0bAyDMKZTqG3wzh4mStFyyzC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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