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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcd61ae048c29b5d3b433b811a40fbfe51d20c91d8bafc5c639f5b8dcbd68a3' 
  AND token = 'BLemNnflx3moec5ZCStLtnUvBeZGgZLDL5CeDahPFDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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