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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb145314051d41c3e49d5dc01c0570a14c337a9f663fed3fd7187ee53d2e99b3' 
  AND token = 'PF0+h04ycxda1sELUPbRJAjWPkLGBdgAMu0831A/7zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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