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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e518196d1a41fa675915e4994b823b3ade0612f9d61ea4e6344bd393706fa91' 
  AND token = 'zqvYm8PL5QtunJ7R5FNAERAWM9aQy1lCBhFmmvWpc5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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