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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91cc0cf63e4300705193ec9f6c41782323c8fdd5b27f106b635f44e8673cb10' 
  AND token = 's8nFsngvi7uqLnRZ48V/RhAUhncj1D8qzninvxmIm0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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