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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1263c5faa1b38ad1a1bcad83c6a25afc63718f1deb2ff2da9d5be3ff17b12e9' 
  AND token = 'gjzIb45F67Jv1JJ/qyftts7DDNveJKI33rEN8m06jz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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