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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e4a8a88b3c42fb03aa5b366377079e2fb0a5b453058bd68b1a455aa54e359e' 
  AND token = '/hya8/QHtQHk9N8FPdGHJu0TJpqxpGmBlZZcwK/7urk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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