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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14eb690bf2409467e8a05706ef2c813a7892f2e266d3068f11ff7024048c74e6' 
  AND token = 'HdC+VBHso+0AbpqrG2WC/CWUWWTZWXLNha3to9m79dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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