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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dcefd10167de820f7ad2a9813b0c4a4e4c17433641c8b06ed968702a9a5b77' 
  AND token = '6Ddfnpb/Nm+HIPrOVG/bKhr9FI0dYwPpYoHoAVxH8Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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