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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd115de81d429e61d617d70cfea39955ad6c0693941ebc7e93ee1cd3344da78a9' 
  AND token = 'qR5xA1Oq9kLUQijenKh3gisU4ftBAH+S8/piV2cX2AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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