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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7092914cf3f9a44089a86aa9cca2b9291087c5778fd267305bda8dc8c56e42d' 
  AND token = '2yd+8jZGP/zY9a6uVetXPy86Xv2SXcgxE5KL+lORG0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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