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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d1c0a9269dd6aec513b8662fa043d48b92ad808a415e353697297b7519071d' 
  AND token = '9G2HfgvU3qTEkcTauDES8cpMwHFxDKuLR9drQnaQIGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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