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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8900201c94f678483b87172811f90f179db0a0eb5bc4cf579ffac2d7f07fc0' 
  AND token = 'rfvZhMoIBiRPvhdB8L8Tz3wrMeqyCotXsy4IQavhU7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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