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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da42f1bbb1bfe9618edf200d9fd73d823ed81ebec587ba99a8986bfd9f928f0c' 
  AND token = '3DI18Im1bINgdnw5602MtH44qwIhJiPl8MX3vuVeeM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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