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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b294a036d71cb79ff4d46db279a0589a4e3abddf0af0d267680232a608078f' 
  AND token = '7FysA3xZS4JkfJoLHELMx+7az4iROKRQhlo0kEy7l/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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