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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a09967fa9fe0a4c4f34ae0e750b9018dc750e7499c396de20c95d10136f19d' 
  AND token = 'LKIJbbo2Yk578xo+jWs9vBFvS5PWab71Aadqq9KqDf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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