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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc6e983233ada17c55839361dfb2e1362165d3e803084006783203fdef78f18' 
  AND token = 'Tq9nickIJd5XjzjbrI5VQRa8Gf3AHqgvtdTNkX9f8FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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