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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f713d8630842daa866cb88a6d8b92596f35106b724e9bea370d0d23376602d7' 
  AND token = 'uyS5lu2sayT2GPryuxZpaLmLG/Cuj8oa4FfuG+2ERBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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