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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb86ef10ecee067f7a301483eb33b93cdda978b0870267a22208deba0cb36a8' 
  AND token = 'EXxBCbk7URUWGLX+OTltzpDLyo2GZduIMHNMcFTkH58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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