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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3813523f36f589cdb1a1de1b41a1e1d6164dceef6fb1a3cc0965c9b0ca3f02b6' 
  AND token = 'C7HPmv/WvT1euPoTkiF43ctMJwwKEuAzbJhGymtZ8Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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