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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37e02786d9f6ffb56a746b79a1c408a5e05fa6c633407d265a59596c2ccd8e2' 
  AND token = 'bfpRYASDmiSmW90hF0ehkz7OKCSxJK6NWeIuNjifImo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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