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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c08872be8d44aa923d34d5257503b205aa5423185cf954859f4061d520ed785' 
  AND token = '/ti4VArHO83pyaG91M85iNq3LlBFCGYiNdrE0GUeeoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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