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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1489030894e66e8ab150b96bce66b7abb0bd63dc008676f79d68d9bdb0acff36' 
  AND token = 'mX1VQSwwQ1NWcw6a8d9oxIxgtjIe2leAjdSPn97jsGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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