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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285d5c30ef63ea41df1690d9f8d67533469cc9465ceda17db86f0c48abb5cadb' 
  AND token = 'j0JMhKgOmMrH9+BgyBhjlghiE1oEFBBX0xq6tjlt+rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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