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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398f837ec621dd3a08ccf5581c19bdd4cc7136160e07deb4465c10b9406edd00' 
  AND token = 'rpravbAaO8PtfoUqSPOjrf94hF8x/AwbBKd31JBFKEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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