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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebbd656082acd8ce6b158781cdf4b792043df7b3d6f393aa592acc5edf6f20e' 
  AND token = 'T6MQ5iCEkf8M1x7NmIkUltMA3aAdhPPfZq+lOKx+wyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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