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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf99793c7246fa88654543ccd6267baec0a447b5db3e8140ef07014e6346ddb' 
  AND token = 'cNZr1Wv/iKPPimdebK6k24K83XRhiSFspReXINutVaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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