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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c04d6614ebc78e3cf69cf667ec99696c98f095a7699a3e078eee52a4f9800b0' 
  AND token = 'Fpd7RFbspls6j7/Xai54quXyKBfBBJIrAmw9ctMiyeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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